Pandipedia entry
How a Packet Finds Its Way
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Transcript
A message crossing the internet travels inside a packet, a small bundle of data.
Its destination IP address identifies where the packet is meant to go.
Picture several routers on one possible route; actual paths can differ.
At each router, the destination is checked against a forwarding table, its list of usable routes.
The table helps it choose a next hop, the next router or network stop.
That router checks the same destination in its own table and chooses again.
No single itinerary guides the journey: packets move through successive next hops, chosen one step at a time.
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